Abstract: The Luming molybdenum deposit occurs in early Yanshanian pluton consisting of adamellite and granite porphyry. The data of petrography and geochemistry show that the SiO2 content varies from 6384% to 7132%， total alkali content varies from 69% to 84%， and w(K2O)/w(Na2O) has an average value of 137. Most of the rocks belong to metaluminousperaluminous high potassium calcallkaline granite. The rocks have high total REE content. LREE is relatively enriched. The chondritenomalized REE patterns show that the curves of REE are right dip types with slightlymoderate negative Eu anomalies. The adamellite and granite porphyry magma which relates to mineralization belong to A2 type granite formed by the crust material source magma evolution. It is inferred that the pluton was formed by the conversion from a postcollisional environment to an extensional environment.

Key words: Luming molybdenum deposit, A2 type granites, geochemistry, early Yanshanian